Improvement in door-bells



. HARRsuN.

Door-Bells..

Patented April22,1873.

" UNITED STATES PATENT OFFICE,

JAMES HARRISON, OF EAST HAMPTON, CONNECTICUT.

IMPROVEMENT IN DOOR-BELLS.

Specification forming part of Letters Patent No. 13S,15 l, dated April 22, 1873; application filed December 4, 1872. p

To all whom it may concm:

Be it known that I, JAMES HARRISON, of East Hampton, in the county of Middlesex and State of Gonnecticut, have invented a new and Improved GongHouse-Bell; andI do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure 1 represents a horizontal section of my invention in the plane x x, Fig. 2, the bell being indicated in dotted lines. Fig. 2 is a vertical central section of the same.

Similar letters indicate correspondin g parts.

This invention consists in arranging the pivot on which the hammer or clapper swings inside the bell, and on a radial line drawn through the center support of the bell, which, running at right angles to the direction of the pull-wire in such a manner that when the pullwire is drawn out, the hammer, which is situated on the outside of the bell, is caused to strike said bell above the center support, and when the prill-wire is released the hammer descends and strikes a second blow beneath the center support. The shank of the hammer connects with a spring, which serves to keep the hammer clear of the surfaceof the bell, and which, also, increases the force of the second blow of said hammer. This spring also acts on an eccentric formed on the shank of the hammer, and provided with a groove to retain the end of the spring in position.

In the drawing, the letter A designates a gong-bell, which is secured to a support, B, fastened in a bed-plate, C. From this bedplate rises a stud or pivot, a, which forms the fulcrum of the hammer D. The shank of the hammer extends beyond said fulcrum pin, and to its inner end is secured the pull-wire E, the hammer itself being situated on the outside of the bell.

By referring to Fig. l of the drawing, it will be noticed that the pivot ais situated on a radial line drawn through the center support B, and running at right angles, or nearly so, to the direction of the pull-wire E, the connection of said pull-wire with the shank of the hammer being made at a point between the center support of the bell and the pivot (a. By this arrangement the hammer is free to swing up and down, and to strike the outside of the bell both on its upward and on its downward.

motion, the upward blow of the hammer being produced by pulling the wire E, and the downward blow by the weight of the hammer, which causes the same to descend as soon as the pull-wire is released.

By examining the drawing, it will be readily understood that unless the relative position of the pivot a, the center support, and the pull-wire is preserved, as above described, the hammer could not be made to strike an upand-down blow on the outside of the bell; and it must be further remarked that, if the hammer strikes the bell on the outside, it is much less liable to injure the bell than it is if it strikes on the inside, and for this reason bells constructed according to my invention are much more durable than bells on which the hammer strik es from the inside.

The shank of my hammer D is provided with an eccentric, b, through which passes the pivot a, the ham mer being secured to the largest radius of said eccentric, while the arm to which the pull-wire is attached extends from the smallest radius of said eccentric. On the circumference of this eccentric bears a spring, d, which is fastened at one end to a stud, e, rising from the bedplate, and which Winds one or more times around the center support of the bell. The loose end of said spring rests in a groove, formed in the eccentric b, and intended to prevent the spring from getting displaced.

If the wire E is pulled so as to raise the hammer, the loose end of the spring travels up toward the highest part of the eccentric, and the spring is strained. If the pull-wire is released, the spring assists in carrying the'hammer down, and the force of the down blow is increased. As the hammer rebounds from the down blow it is caught by the spring and retained clear of the body of the bell, in the position shown in Fig. 1.

It will be readily seen that the connection between the spring and the shank of the hammer could be modified in various ways, and I do not wish to be confined to the precise mode of attaching the spring, as shown in the drawing. Furthermore, in my bell the action of shani( of the hammer D, the puii-wire E, and the hammer does not depend upon the spring, the beli A, substentially in the manner and and if the spring should break the hammer for the purposes set forth.

would still continue to act; but its down blow 2.` The eceentrio b, formed on the shank of would, in this ease, depend soieiy upon the the hammer D, and provided with a groove, f, weight of the hammer. This effeot is due in eombination with the spring d,pu11-wireE, nainiy to the relative position of the pivot a, and be11A,a11 eonstruoted and Operating Subthe center support of the bell, and the puilstantially in the manner shown and described. wire, as previously described. JAMES HABRISON.

What I claim as new, and desire to secure Witnesses:

by Letters Patenta, is- E. F. KASTENHUBER, 1. The ,oonbination of the spring d with the GHAS. WAHLERS. 

